Yo, I have a question regarding memory. Is the differences between PC2700, PC3200 and PC4000 that much more noticeable for the price difference, and is it worth the extra money to go to PC4000. What kind of differences would one notice? Same with DDR SDRAM, is it that much better than just DDR? Would it be better to go with say two sticks of DDR SDRAM 512MB than say Dual DDR 512MB's?